Alert archive / Pennsylvania / Areal Flood Advisories in 2021
Areal Flood Advisory 48, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this areal flood advisory at Jul 3, 2021, 6:39 PM EDT for Bucks County, Lehigh County, Northampton County, Pennsylvania. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 3, 2021, 6:39 PM EDT (22:39 UTC)
- Expired
- Jul 3, 2021, 8:54 PM EDT
- In force
- 2 hr
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Lehigh County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 107 km from the middle of the area, began a volume at 22:40 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.7 hours before the alert went out and 217 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3326 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 112 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
025
WGUS81 KPHI 032239
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
639 PM EDT Sat Jul 3 2021
PAC017-077-095-040145-
/O.NEW.KPHI.FA.Y.0048.210703T2239Z-210704T0145Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Lehigh PA-Northampton PA-
639 PM EDT Sat Jul 3 2021
The National Weather Service in Mount Holly has issued a
* Flood Advisory for...
Southeastern Lehigh County in eastern Pennsylvania...
South Central Northampton County in eastern Pennsylvania...
Northwestern Bucks County in southeastern Pennsylvania...
* Until 945 PM EDT.
* At 639 PM EDT, Doppler radar indicated heavy rain. Minor flooding
is ongoing or expected to begin shortly in the advisory area.
* Some locations that will experience flooding include...
Allentown, Bethlehem, Emmaus, Quakertown, Hellertown, Pleasant
Valley, Springtown, Lehigh University, Fountain Hill, Coopersburg,
Richlandtown, and Trumbauersville.
This includes the following highways...
Interstate 78 in Pennsylvania between mile markers 58 and 67.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be aware of your surroundings and do not drive on flooded roads.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4059 7553 4063 7546 4066 7540 4044 7516
4037 7533
$$
MPS2 follow-up statements
273
WGUS81 KPHI 040005
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
805 PM EDT Sat Jul 3 2021
PAC017-077-095-040145-
/O.CON.KPHI.FA.Y.0048.000000T0000Z-210704T0145Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Lehigh PA-Northampton PA-
805 PM EDT Sat Jul 3 2021
...FLOOD ADVISORY REMAINS IN EFFECT UNTIL 945 PM EDT THIS EVENING
FOR SOUTHEASTERN LEHIGH, SOUTH CENTRAL NORTHAMPTON, AND NORTHWESTERN
BUCKS COUNTIES...
At 805 PM EDT, Doppler radar indicated that the heaviest rain has
ended and moved out of the advisory area. However, several bands of
light to locally moderate rain will continue. Minor flooding is
ongoing in the advisory area.
Some locations that will experience flooding include...
Allentown, Bethlehem, Emmaus, Quakertown, Hellertown, Pleasant
Valley, Springtown, Lehigh University, Fountain Hill, Coopersburg,
Richlandtown, and Trumbauersville.
This includes the following highways...
Interstate 78 in Pennsylvania between mile markers 58 and 67.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 4059 7553 4063 7546 4066 7540 4044 7516
4037 7533
$$
MPS665
WGUS81 KPHI 040054
FLSPHI
Flood Advisory
National Weather Service Mount Holly NJ
854 PM EDT Sat Jul 3 2021
PAC017-077-095-040104-
/O.CAN.KPHI.FA.Y.0048.000000T0000Z-210704T0145Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bucks PA-Lehigh PA-Northampton PA-
854 PM EDT Sat Jul 3 2021
...FLOOD ADVISORY IS CANCELLED FOR SOUTHEASTERN LEHIGH, SOUTH
CENTRAL NORTHAMPTON, AND NORTHWESTERN BUCKS COUNTIES...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 4059 7553 4063 7546 4066 7540 4044 7516
4037 7533
$$
MPSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 3, 1:38 PM EDT | Special Weather Statement | PHI | Delaware | 52 min |
| Jul 3, 2:03 PM EDT | Areal Flood Advisory | PHI | Delaware | 2 hr |
Nearby
Areal Flood Advisories in Pennsylvania, 2021Every areal flood advisory in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.